Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
And I need confirm this: 1. when I connect a disconnected drbd resource, the resource will perform a quick sync 2. The quick sync will keep the data order and provide data integration. 2011/9/21 Andy Jewell <Andy.Jewell at sysmicro.co.uk>: > Wouldn't it be better to run in asynchronous mode so your writes on > the master don't block while the data is shipped to the secondary? > There's obviously a trade-off with coherency on the secondary but you > don't have the latency. > > Sent from my iPhone > > On 20 Sep 2011, at 18:18, "Mia Lueng" <xiaozunvlg at gmail.com> wrote: > >> HI All: >> >> In our case, we use drbd to sync oracle db data in two node across the >> wan. Since the net bandwidth is slow(<2M), the i/o performance is >> pretty poor in primary node because i/o operation will be pending to >> wait the data transmission. >> So we have considered the following solution: On secondary node, >> run disconnect and connect command in sequence . Diconnect drbd0 , >> wait 5 minutes (or longer time), connect drbd0 again, and after sync >> complete , disconnect drbd0 again. But we are wondering the follow >> issues: >> >> 1. How can we confirm that each sychorinzation after connecting is a >> quick sync and not a full sync? And how to tune it to be that. >> 2. the secondary node disconnect drbd0 only when the cstate is >> Connected and dstate is UptoDate. Can the data integration of db data >> be guaranteed? In other words, If the primary node crash at this >> moment, the oracle db can be started on the secondary node? And in >> quich sync , Is the data written on secondary node in the same order >> as it written on primary node ? >> 3. is the activity log size tuning helpful for this situation? >> _______________________________________________ >> drbd-user mailing list >> drbd-user at lists.linbit.com >> http://lists.linbit.com/mailman/listinfo/drbd-user >